Hey guys, I have a '07 Peterbilt 386 with a C13 and the fan will not shut off. I have confirmed that the fan solenoid functions properly, however the power going to the fan solenoid with the key on engine running is only 2.2 volts. I disconnected the wiring harness on the engine bay side where it goes into the firewall and did not see any corrosion on the pins there, for whatever that's worth. Thanks for any help or direction
07 Peterbilt 386 low voltage to fan solenoid
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Con707904, Dec 18, 2025.
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